Thrust boring-machine.



No. 888,858. PATENTED APR. 7, 1908. G. GHRISTIANSEN.

THRUST BORING MACHINE.

- APPLICATION FILED APR.27.1907' UNITED STATES PATENT OFFICE.

CHARLES GHRISTIANSEN, OF GELSENKIRCHEN, GERMANY.

THRUST BORING-MACHINE.

To all whom it may concern:

Be it known that I CHARLES CHRISTIANSEN, a subject of the King of Prussia, and a resi dent of Gelsenkirchen, Province of \Vest- 5 phalia, Kingdom of Prussia, and German Empire, have invented a certain new and useful Hand-Manipulated Thrust Borin Machine, of which the following is a specii ication.

The subject matter of this invention has reference to hand manipulated thrust boring machines of such construction as to be adapted especially for use in mining operations, but which might also be employed 15 with advantage for other purposes as Well,

Where it is essential to impart a great number of blows in rapid succession to a tool or implement, re ardless of its being a chisel, a borer-or the like.

The new hand manipulated thrust boring machine is operated by compressed air an the most important improvements in this machine comprise special means of control, a device for the introductionof air into the boring hole for the purpose of removing the boring dust and a very practicable attachment of the borer or other tool or implement in the machine.

The new arrangement is illustrated on the accompanying drawing in Figures 1, 2 and 3,

Fig. 1 being a longitudinal section through the machine and F1 2 being a cross section on the line AB, iniig. 1. Fig. 3 illustrates a modification of the controlling valve or flap of Fig. 1.

Rock boring machines have been known heretofore, the operation of which is controlled by an automatic valve in such a manner, that the com ressed air forces the valve against its seat a ternately on one side and then on the other side,'thereby keepin the enteringchannel closed at this side, unt' the opposite stroke of the working piston is to be commenced. Rock boring machines have also been used heretofore, in which the controlling of the valves is effected in a similar manner bymeans of balls. These well-known controlling means however, present the inconvenience, that they do not operate uniformly in consequence of the weight of the controlling, parts, when the boring machine is for instance directed downwards or upwards.

According to the invention, about to be described, a flap valve, is to be employed as controlling means, the weight of said valve Specification of Letters Patent.

Application filed April 27 1907 Patented April 7, 1908.

Serial No. 370,698.

and in the position of the flap valve 1, shown in the drawing, the fluid passes through a channel 4 into the cylinder 5 and pushes the piston 6 towards theileft, while the air at the rear of the iston 6 escapes through the channel 7. moved over the bore or channel 7, thereby closing the same, tlie momentum imparted to the piston 6 causes a compression of the air, which has remained at the rear of the piston, during'the continuance of its backward movement, whereby an over pressure is produced in front of the flap valve 1, as compared with the air entering at 3. In consequence thereof, the fiap valve will be reversed, that is to say it will turn around on its axis 2 and will uncover the entrance passage 9. Now, the air entering throu hthe passage 9, operates at the rear of t e piston, pushing the piston forward, while the air in front of the piston escapes through the channel 8,-which has been 0 ened meanwhile. peated in the inverse order. The flap. valve 1 may alsobe secured in position according to the arrangement shown in Fig. 3, the

Vhen the piston 6 has been The same procedure wi then be res manner of operation of the valve controlling mechanism being absolutely unaffected thereby.

As will be seen from Figl'l, of the drawing, the machine is provided in the well known manner with a reversing device for the piston, that is to say with a device for imparting rotation to the piston, with a" view, of imparting a rotating movement to the borer at the time the piston moves backward. As a means for rotating the piston, .a threaded spindle 26 is provided, which engages with a correspondingly threaded bore of the piston 6, so that the piston is compelled to perform a rotating movement as spindle 26 is connected with a well known ratchet arrangement. This rotating movement is transmitted to theborer 19, since the sleeve 27 engages by means of projections or pins attached thereto, (but not shown in the drawing) with the grooves 17 of the pushing rod. The sleeve 27 is connected by screw threads to the sleeve 20 or it may be made in one piece with the same, so that therefore the rotating movement of the iston 6 and of the pushing rod 18 is transmitted to the sleeve 20 which carries the borer 19 and consequently to the borer itself also. This device for producing a' rotary movement of the piston is known by itself and does not form the subject matter of the claim.

The device, above referred to and constituting an important feature of my invention, of rinsing with air, that is to say of blowing air into the boring hole for the purpose of removing the bore dust, is so arranged, that it can easily be thrown out of o eration, that is to say that the introduction air into the boring hole is interrupted. As a rule, the rinsingis necessary in such cases, where the borer is worked in a downward direction. The boring dust collects at the bottom of the boring hole and is blown out by the air blown in and introduced by a hollow borer down to the bottom of the boring hole. When the machine is employed in such a position, that the borer is horizontal or is even directed upwards, the removal of the boring dust from the hole by rinsing with air is not always necessary, inasmuch as the dust in this case does not interfere with the work or drops out from the hole by itself. In such cases the air rinsing device should be disengaged and an ordinary.

borer may then of course. be substituted in place of the hollow borer.

The air rinsing device is shown in Fig. 1. During the backward movement of the piston, pressure air is contained in the front part of the cylinder 5, that is to say in front of the piston. Part of this air passes through the bores 10 and 11, provided in the front abutting ring 12, into the groove 13, provided in the ring 14 which surrounds the abutting ring when this ring 14 is in the position shown in Fig. 2.

ting ring 12 into the circular passage 16 and flows then'through the ports 17 in the pushing rod 18 of, the piston 6 into the hollow borer 19 and thence through the latter to the bottom of the boring hole. The ring 14 with the groove 13 is rotatably arranged on the abutting ring 12. Therefore, when it is desired to have the machine operate without air rinsing, a slight rotation of the ring 14 in relation to the abutting ring 12 is suliicient to disconnect the bores or passages 10 and 11 from the groove 13, so that the air, coming from the cylinder 5, is prevented from passing further.

I What I claim and desire to secure by Letters Patent of the United States is A boring machine provided with a cylinder, an inclosed piston, a pair of compressed air inlet ducts communicating with, opposite ends of the cylinder, a flap valve fulcrumed at its center of gravity and con trolling both of said ducts, a pair of exhaust ports in the cylinder adapted to be alternately uncovered by the piston, and a boring bit operable by said piston, substantially as specified.

' In Witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

CHARLES CHRISTIANSEN.

Witnesses:

H. CHRIsTIANsEN, LoUIs VANDORN.

From the groove 13, the air passes through a'bore in the abut- 

